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Sounds like your AC power supply (wall wart) is dead. You can purchase one directly from Radio Shack (they may have to order it) just by telling them it's for the 433. You can also purchase a compatible power supply from UnidenDirect.com (Uniden made the 433 for Radio Shack), or you can find one on eBay. The output specifications for the power supply are 12VDC, 500mA minimum, center (tip) positive.

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Hello ... IF YOU HAVE A COMPUTER YOU CAN MAKE PROGREMING, DETETINMG AND TRUNKING A BREEZE.
IF NOT I FOUND THAT ALL FIRE AND POLICE TRUNKING ACTIVITIES ARE BETWEEN 840.0000 through 900.0000.
WHEN YOU WANT TO SAVE A CHANEL TURN OFF RADIO AND TURN BACK ON SELECT THE DESIRED CHANNEL YOU WANT. THEN PRESS "PGM" AND ENTER YOUR FREQERNCY... PRESS ENTER AND IF YOU WANT TO ADD ANOTHER CAHANNEL ... HIT "PGM" AGAIN AND FREQ. AND ENTER. YOU CAN KEEP DOING THIS TILL YOUR DONE GROGRAMING .. THEN JUST HIT SCAN AND IT WILL SCAN ALL THE FREQ.S YOU HAVE ENTERED.
HERE IS A SOFTWARE PROGRAM THAT CAN LOOK UP ALL FRQ ANYWHERE IN THE US AND WITHE A PLUGIN DOWN LOAD ALL THE CHANNELS.
BuTel software home page
ARC-433 software for Radioshack PRO-433 / PRO-528 / PRO-2051
'ARC433 is now available!'
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ARC433 (US$ 29.95) is dedicated software for the RadioShack PRO433, PRO528 and PRO-2051 and is the most versatile software available for the Radio-shack PRO-433 / PRO-528 / PRo-2051.
Screenshot from our memory editor: the most versatile memory editor available on the market:
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Overview of options in ARC433:
Order ARC433 now online using PayPal/credit card or call Santa at 1-800-SCANNER
ARC433 supports the Radioshack PRO433, PRO528 and PRO2051 models in one single software package.
ARC433 includes THE most versatile memory editor available on the market.
Radioreference.com import option for conventional and trunk systems! Programming your scanner was never this easy!
Enhanced CSV file import and 'mapper'
Paste Frequencies DIRECTLY from any website using 'Paste Special'
Setup channels in an easy, spreadsheet type interface.
User Manual (45 pages, PDF file)
Store Unlimited number of configurations on your harddisk.
Copy/Move/Swap memory banks / memory channels
Compatible with Windows 2000 / XP.
All updates are free for registered users
Easy cut/copy/paste data between channels and banks.
Move channels up and down with quick move buttons
Export CSV data
Fill down/series option
Full clipboard support for import/export data to/from other applications
Easy data toggle with mouse double click or space bar or keyboard shortcuts
Sort frequencies per bank
Remove duplicate frequencies
Easy Fill for setting up new banks in a few seconds (enter a start frequency and a step, and easyfill will calculate and fill the selected bank)
Extra Dummy bank for storing temporary data while you are re-organizing your scanner channels.
Print option
System Requirements:
Windows XP/2000/Vista
PC interface cable 20-047 for USB or PC interface cable 20-289 for serial port
Use other cables at your own risk! Use the ARC433 demo version to verify communication works before purchasing the software! All software sales are final.
Order ARC433 for PRO 433 / 528 now online using PayPal or a credit card or call 1-800-SCANNER.
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Screenshots: